STENOPAEIC SLIT USED IN OPHTHALMIC PRACTICE
Stenopaic slit is an elongated pinhole which is used to allow the light transmission in one meridian and is a useful tool for the correction of astigmatism.
The width of the slit aperture ranges between 0.50–1.00mm and the length is 15mm and is assumed to limit the light admission to one meridian.
When slit is used for meridional refraction, only spherical trial lenses are used to correct the refractive error in different meridians.
OPTOMETRY-SHARP VISION
Optometrist